Where did Aaron die?

Aaron died on mount Hor.

And Moses did as the LORD commanded: and they went up into mount
Hor in the sight of all the congregation. And Moses stripped Aaron
of his garments, and put them upon Eleazar his son; and Aaron died
there in the top of the mount. Numbers 20:27-28

And Aaron the priest went up into mount Hor at the
commandment of the LORD, and died there. Numbers 33:38

Aaron died at Mosera.

And the children of Israel took their journey from Beeroth of
the children of Jaakan to Mosera: there Aaron died, and there
he was buried. Deuteronomy 10:6